Motor control.



A. T. KASLEY & C. N. F. KNAPE.

MOTOR CONTROL.

APPLICATION FILED JULY 30,1910.

1,1 89,697. Patented-July 4, 1916.

2 SHEETS-SHEET l.

Cmum. M 0W 1. MM S QW EIEATTORNEY IN' FACT.

A. T. KASLEY & C. N. F. KNAPE.

MOTOR CONTROL.

APPLICATION FILED JULY 30. 1910.

1 ,1 89 69? Patented J uly 4, 1916.

2 SHEETS-SHEET 2.

WITNES: INVENTORS THE/RATTORNEY IN FACT.

UNITED srnrns PATENT QFFTQE.

ALEXANDER T. KASLEY, OF SWISSVALE, AND CHARLES N. F. KNAPE, OF PITTSBURGH, PENNSYLVANIA, ASSIGNORS, BY MESNE ASSIGNMENTS, TO THE COLONIAL TRUST COMPANY, TRUSTEE, OF IE'I'LTSBUIRABrE' PENNSYLVANIA, A CORPORATION OF PENN- SYLV'ANIA.

MOTOR CONTROL.

Specification of Letters Patent.

Patented July a, 1916.

To all whom it may concern:

Be it known that we, ALEXANDER T. KAS- LEY, a citizen of the United States, and GHARLESIN. F. KNAPE, a subject of the King of Sweden, residing at Swissvale, in the county of Allegheny and State of Pennsylvania, and Pittsburgh, in the county of Allegheny and State of Pennsylvania, respectively, have made a new and useful In vention in Motor Control, of which the following is a specification.

.This invention relates to means for controlling the speed of motors by throttling or changing time of cut-off of the charge of the motive fluid.

One object of the invention is to provlde fluid actuated means for maintamlng an approximately constant speed over a variation of loads by increasing or decreasing the pressure on an admission valve interposed between the motor inlet and the source of supply to vary the amount of fluid fed to the motor.

Another object of the invention is to avoid the use of thrust collars in a governing mechanism and thereby eliminate the attendant disadvantages.

Another object of the invention is to provide a speed responsive device which may be actuated direct from the engine shaft and which may be contained within a casting or casing forming part of the engine casing.

The invention further consists in simplifying the usual construction of speed responsive devices used in connection with motors and particularly with turbines. For convenience of illustration we have shown the invention as applied to a turbine of the impulse type, the shaft of which is adapted to drive a pump having communication with a cylinder in which is a piston to act against a spring actuated 'valve so that under light load conditions pressure will be caused to accumulate in the piston cylinder and the valve will be closed but when the motor is rumiing at normal or less than normal speed practically no pressure will be piled up in the piston cylinder and the valve will be 1 opened by a spring acting in opposition to the piston. It is to be understood however that we do not limit our invention to the arrangement disclosed nor do we desire to limit it for use in connection with any particular type of motor, the turbine being shown merely as a conventional form of motor to which the invention is adapted.

p In the drawings: Figure 1 is a vertical longitudinal sectional view through a turb1ne casing, a fluid pressure device, a relay and a valve forming one embodiment of our invention; and Fi 2 is a sectional view on the line 2-2 of Flg. 1 looking in the direction of the arrow.

Referring now to the drawings by numerals of reference, 5 designates a pipe in communication with a suitable source of supply as, for example, a steam. boiler.

6 is a valve casing in communication with the pipe 5 and provided with an outlet port 7 to feed steam into a port or conduit 8 leading from the valve casing 6 to the casing 9 of a turbine whereby the steam may operate the turbine rotor 10 by being delivered to the impulse blades 11. The rotor 10'is carried on a shaft 12 in a bearing 13 in the casing 9. Within the valve casing 6 is a balanced valve 14 shown in the drawings as being in the mean position so that steam may enter from the pipe 5 through the ports 15 as indicated by the arrows, when the valve 14 is not seated. The valve 14 is provided with a stem 16 having a collar 17 thereon against which one end of the spring 18 bears, the other end of the spring being seated upon the end of the casing 6. The stem 16 of the valve 14 projects slightly beyond the collar so as to contact withthe stem .19 on a piston 20 of an oil relay .21, the cylinder 22 of which is provided wlth an inlet port 23 and an outlet port 24. The pressure delivered an eccentric having two longitudinal ports 29 and 30 adapted to normally communicate with each other but to be temporarily out off from each other by a centrifugally actuated valve 31 in a recess 32 inthe casting 27. The valve 31 is held in its normal position by a spring 33 one end of which bears against a seat 34 in the valve and the other end of which is shown as bearing against a plug 35 in the recess 32. The port 29 communicates with a port 36 in the casing 37 of the pump, the part of the casing 37 forming the'port 36 being shown as depending into an oil well or fluid holding receptacle 38 in the casing 25. The'port 29 communlcates with the interior of the casing 37 through a lateral port 39 and the port 30 communicates with the interior of the-cas1ng 37 through a lateral port 40. By reference to Fig. 2 it will be observed that the casing is provided with two lateral gates or abutments 41 and 42 which are normally pressed against the eccentric rotor of the oil pump by means of springs 43 and 44.v Thus it will be apparent that when the rotor is rotated oil may be drawn through the port 36 into the port 29 from which it will pass through the port 39 into the casing 37 and throu h port 40 passing into the port 30. If t e speed of the rotor is not in excess thereduoed "portion 45 of the valve 31 will permit the oil to pass back into the port 29 and little or no pressure will be piled up in the pipe 46 which communicates with the port 30 at 47 and with the cylinder of the relay device at 23. If, however, the speed of the motor is such that the valve 31 will be moved against the spring 33 so as to close communication between the ports 29 and 30, the oil will be drawn through the port 36 into the port 29 out through the port 39 into the casing of the pump and into the port 30 through the port 40. As it cannot then get back into the port 29 it will have to pass through the pipe 46 into the oil relay moving the piston from right to left to close the valve. If the speed of the motor is such that communication between the ports 29 and 30 is only partially cut off some pressure will accumulate in the pipe 46 and therefore in the cylinder 22 so that the piston 20 will be actuated in proportion to the speed of the motor and consequently partially close or permit the inlet port to be open 1n proportion to the speed of the motor which drives the pump. Any oil that may leak past the plston 20 may escape through the port 24 into the oil well. If desired a sight cup 47 may be provided in communication with the oil well 38 through the medium of a pipe 48 whereby the level of the oil may be determined at all times.

If desired the oil or other fluid from the cylinder 22 may exhaust through a pipe to the bearings of the motor to lubricate them or the tank or casing 25 may be positioned above the bearings and oil may exhaust from said casing 25 onto the bearings.

When the several mechanisms are not operating, the element or rotor 28 of the pump will be at rest. If,now, the rotor 10 has motion imparted to it, it will carry the rotor '28 with it, the centrifugal action of which will pull oil through the port 36 into 29.

If the weighted valve is not moved against the spring 33 far enough to close the port 29 at 45, the oil will pass through 39 around the circumferential groove; will enter port 30, through 40, will pass into port 29, out through 39, and circulate back as just described. If the speed of the pump rotor 28 is such that the centrifugal force will cause the weight to counteract the weight of the spring so that the port 29 at 45 is closed,

the oil drawn through 36 will pass into 29,

through 39, 40, and 30, and then into pipe '46, and exert pressure against the piston 20 to the actuate the valve 14. If the rotor 10 slows down, the weighted valve will cause ports 29 and 30 to again communicate and the pressure will be relieved in the port 40 so that the valve 14 will be caused to open.

It is apparent of course that changes in proportion, design and minor details of construction may be resorted to without departing from the spirit of our invention or sacrificing any of its advantages, and we would therefore have it understood that we do not limit ourselves to the exact details shown but reserve the right to make such table member for causing fluid pressure to accumulate and a centrifugal valve rotatable therewith for determining the accumulated pressure.

2. In a device of the class described, means for admitting fluid to a motor, a fluid actuated device for moving said means and a pressure accumulating device comprising a rotatable member, av casing therefor connected to the fluid actuated device, a plurality of ports in the rotatable device and means carried by the pressure accumulating device for automatically cutting off and permitting communication between two of said ports whereby the amount of pressure 'in the pressure actuating device may be determined.

3. In a device of the class described, a combination with a fluid actuated valve seatmg mechanism, of means for actuating said mechanism comprising a fluid pump having a a centrifugal pressure control means rotatable with one of the pump elements for governing the amount of pressure upon the valve seating mechanism.

4. In a device of the class described, a motor and a source of supply, a valve intel-posed between the source of supply and the motor, means for actuating said valve and means for actuating the actuating means comprising a pump having a runner driven by the motor and means carried by the runner for by-passing fluid past the inlet port toward the actuatingmeans and for introducing fluid into the actuating means.

5. In a device of the class described, a pump having an inlet and an outlet port, and means acted upon directly by centrifugal force for by-passing fluid within the pump so as to prevent its passage through the outlet port.

6. In a device of the class described, a rotary pump having inlet and outlet ports and self-contained means carried by the rotary member of the pump for preventing egress of the fluid through the outlet port.

7 In a device of the class described, a casing, a rotatable piston in the casing, ports in the piston said ports being adapted to communicate with each other at a plurality of points and means carried by the rotating piston for closing communication between said ports at one point.

8. In a device of the class described, a turbine having a casing provided with an opening, a second casing connected to the turbine casing and surrounding said opening, a member connected to the rotor element of the turbine and projecting through said opening into the second casing and comprising a pump piston, a casing surrounding the pump piston and havin inlet and outlet openings and means carried by the pump piston for determining the pressure accumulating at the outlet opening.

9. In a device of the class described, an oil relay and means for accumulating pressure in said relay comprising a rotatable piston, a casing surrounding said piston, ports in said piston adapted to communicate with each other and with the inlet and outlet openings in the casing and a centrifugal valve carried by the rotatable piston for closing communication between said ports.

10. In a device of the class described, a pump compressing casing having an inlet and an outlet, of a rotor within the pump, means carried by the rotor for by-passing some of the liquid past the outlet back through the rotor and means for preventing the by-passing of the liquid.

11. In an engine having adjustable means for controlling the amount of steam supplied thereto, a fluid pressure operated mechanism for effecting the adjustment of said means, and a valve controlling the flow of fluid in said fluid pressure operated mechanism and acted upon directly by centrifugal force.

12. In combination with an engine having a valve for controlling the delivery of motive fluid supplied thereto, a pressure pump driven by the engine and controlling the tive fluid thereto, a pump for controlling the operation of said means, and having an inlet and an outlet port, and means directly actuated by centrifugal force and responsive in operation to the speed of the engine for placing the inlet and the outlet ports of said pump in communication with each other within the pump. 1

15. In combination with an engine and its inlet valve, pressure responsive means for controlling the operation of said valve, a pump for delivering actuating pressure to said means, and a valve acted on directly by centrifugal force and responsive in operation to the speed of the engine for controlling the delivery of pressure from said pump to said means.

16. In combination with an engine and its motive fluid admission mechanism, pressure responsive means for controlling the operation of the mechanism, means for delivering actuating pressure to said pressure responsive means, comprising a rotatable piston having passages formed therein, adapted to communicate with each other and with inlet and outlet ports provided in a casing surrounding the piston, a casing surrounding the piston, havmg inlet and outlet ports formed therein, and a centrifugally actuated valve responsive to the speed of the engine for controlling communication between the passages of said-piston.

In testimony whereof, we have hereunto subscribed our names this 28th day of July, 1910.

ALEXANDER T. KASLEY. CHAS. N. F. KNAPE.

Witnesses:

C. W. MGGHEE, B. F. FUNK. 

